2. months after each STI (only STI group) i. Biochemical analysis: ALT, AST, cholesterol (total and HDL), triglycerides ii. CD4 count, CD8 count iii. Plasma HIV-RNA, Genotype iv. Clinical evaluation: disease progression, lipodystrophy assessment Every 2 months thereafter (STI group and control group) i. Biochemical analysis: ALT, AST, cholesterol (total and HDL), triglycerides ii. CD4 count, CD8 count iii. Plasma HIV-RNA iv. Clinical evaluation: disease progression, lipodystrophy assessment Additional tests